Enums :

public enum RoomStatus {
    EMPTY
    NOT_EMPTY;
}

public enum RoomType{
    SINGLE,
    DOUBLE,
    TRIPLE;
}

public enum PaymentStatus {
    PAID,
    UNPAID;
}

class User{

int userId;
String name;
Date dateOfBirth;
String mobNo;
String emailId;
String sex;
}

// For the room in any hotel
class Room{

int roomId;
int hotelId;
RoomType roomType;
RoomStatus roomStatus;
}

class Hotel{

int hotelId;
String hotelName;
Adress adress;
List<Room> rooms; // hotel contains the list of rooms
float rating;
Facilities facilities;
}

// a new booking is created for each booking done by any user
class Booking{
    int bookingId;
    int userId;
    int hotelId; 
    List<Rooms> bookedRooms; 
    int amount;
    PaymentStatus status_of_payment;
    Time bookingTime;
    Duration duration;
}

class Adress{

string city;
string pinCode;
string streetNo;
string landmark;
}

class Duration{

Time from;
Tiime to;
}

class Facilities{

bool provides_lift;
bool provides_power_backup;
bool provides_hot_water;
bool provides_breakfast_free;
}